Hydraulic press.



W. P. BETTENDORF, DECD.

J. w. nm'rrmnonr, ADMINISTRATOR.

HYDRAULIC PRESS.

APPLICATION FILED JAN.14,1910.

1,028,986. Patented June 11, 1912.

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Patented June 11 1912.

W. P. BETTBNDORF, DECD. J w nn'rrnnnonr ADMINISTRATOR HYDRAULIC PRESS.

APPLICATION FILED JAIL, 1910 IIIII W. P. BETTENDORF, DEOD. J. w. BETTENDORI, ADMINISTRATOR.

HYDRAULIC PRESS. APPLICATION FILED JAN.14, 1910.

Patented June 11, 1912.

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WILLIAM P. BETTENDORF, OF TRATOR OF SAID BETTENDORF, IOWA; J. W. BETTENDORF ADMINIS- WILLIAM P. BETTENDORF, DECEASED.

HYDRAULIC PRESS.

Specification of Letters Patent.

Patented June 11, 1912.

Application filed January 14, 1910. Serial No. 538,038.

To all whom it may concern:

IDORF, a citizen of the United States, residing at Bettendorf, in the county of- Scott and State of Iowa, have invented new and useful Improvements in Hydraulic Presses, of which the following is a full, clear, and exact description.

My invention relates to hydraulic presses and their connections and is adapted to be used in connection with the pipes connecting what is commonly known as the pull-back cylinders of such a press and the accumulator cooperating therewith.

The principal object of my invention is to prevent, by automatic means the possible danger to life and limb of the operators, or injury to the valuable dies and mechanism of hydraulic presses when a break occurs in the pipes connecting the pull-back cylinder or cylinders thereof to the counterbalancing accumulator.

A further object of my invention is to provide means that will permit the flow of the water through it in either direction, but which will automatically close, and lock the ram and its load in whatever position it may be in, at the time the break in the pipe-line OCCUI'S.

A further object of my invention is to permit the escape of a jet of water should the operator, unaware of the break in the pipe-line, attempt to operate the press, and if desired utilize said jet to warn the operators, and enable them to avoid a greater catastrophe. This I accomplish by the means hereinafter fully described and as particularly pointed out in the claims.

In the drawings :Figure 1 is a top plan View of the emergency valve of my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a similar view of the opposite side of said valve. Fig. 4 is a vertical central section of the same. Fig. 5 is a bottom plan View thereof. Fig. 6 is a diagrammatical view of the system including the several mechanisms embodying my invention.

In the drawings 2 represents a hydraulic press including its bed, its platen, its ram, and its bolster, with the cylinder for the ram made integral therewith, and 8, 3, represent the pull-back cylinders, which are made integral with the bolster, and are located on each side of the ram. The pistons, 4, of these pull-back cylinders have the platen of the press attached to their lower ends and their duty is to lift the platen, the heavy dies carried thereby, and the ram after the dies have performed their work, back to their original positions. These pullback cylinders are connected by branch pipes 5, 5, to a pipe 6 that leads to and communicates with the lower end of an accumulator, 8, which latter comprises a vertically disposed cylinder having a pistonhead therein, the piston of which extends out of the upper end of its cylinder and is weighted in any suitable manner. When the water is forced out of the pull-back cylinder by the downward movement of the ram, it flows through pipes 5 and 6 into the accumulator cylinder and lifts the pistonhead and piston thereof, and a total weight slightly exceeding the combined weight of the platen, the dies, the ram and the pullback pistons, and after each working movement of the ram; this weight, through the medium of the water, automatically restores the platen, and ram, and dies to their orig inal posit-ions. At the junction or confiuence of the pipes 5, 5, with pipe 6, which latter is, preferably, located right next the bolster of the press, I arrange automatic devices, which in the emergency of a leak of sufficient magnitude occurring anywhere in pipe 6, will close and confine the water in the pull-back cylinders, and lock the ram, the platen, the dies and so forth in the position they may be in at the time of the break. This automatic device consists of a floatingvalve, and escape-vent combined in the same casing or housing. In the drawings, A, represents the metal housing for said valve and bears a crude resemblance in shape to the letter d when viewed in the position shown in Fig. 4c. The inlet a, to which pipe 6 is connected, is located at the lower angle of the loop of the d of the housing, and the bore Z) leading from said inlet extends upward and then laterally to the vertical body of the housing, and then continues vertically to the upper wider chamber B in the upper portion of the vertical part thereof, thus pursuing a stepped course therethrough, substantially as shown. The upper end of chamber B is closed by a circular or other suitably shaped head C, which is held in place by screws, and has its inner surface constructed so as to compress a suitable gasket or ring in the rabbeted edge of the upper end of chamber B. This head C is also provided with a central boss (I, which extends down into and is concentric with chamber B, and is provided with a vertical central bore or dashpot C, the upper part of which has escape vents, and the mouth of which is slightly contracted to form a guide-bearing for the upper end of the vertical central stud or spindle e of the valve D. This valve consists of a circular disk the margins of the underside of which are seated on the shoulder, E, made by increasing the diameter of the main-passage to form chamber B, and said valve is opened against the expansive pressure of a coil-spring interposed between it and said head C.

The underside of valve D is, preferably, provided with integral depending wings, that radiate from the axial sides of the bore b to guide the valve and prevent its tipping or binding.

Chamber B, has usually two outlets, F, leading laterally therefrom through pipes, 5, to the pull-back cylinders of the press, and has an escape vent extending from it, preferably at right angles to the axes of said outlets, in the outer wider portion of which a spindle-valveG, has reciprocal play. Near the seat for the beveled inner end of this spindle-valve, said vent is provided with an offset passage h, and when the pressure against the inner end of valve G is enough to move it outward-a distance sufficient to uncover the entrance to said passage, the liquid or water under pressure will escape through this vent into the outer atmosphere in the vicinity of the operator, and prevent the explosion which might otherwise occur if the operator should attempt to operate the press after a break in the pipe-line, and warn him to cease the attempt, as will here inafter more fully appear. The outer end of valve G, is, preferably, reduced and seated in the central socket of a centeringplate j for a comparatively heavycoil-spring I, which latter alines with valve G, and has its outer end seated in a centering-plate J corresponding to j. This outer centering-plate has a gage-screw K engaging the outer side thereof, which screw is tapped through the bend of a suitable yoke k, and is manipulated to obtain a resistance for said valve G, exceeding that to which its inner end would be subjected when the water in said pipe line was under its normal operative pressure.

The lower portion of the vertical part of the D-shaped housing A is provided with a vertical cylindrical chamber, L, which exthe escape of any seepage that may accumulate therein.

Chamber L is, preferably, greater in diameter than the main-passage, and has a piston-head N therein, to which a piston-rod n is secured that extends centrally up through a suitably packed opening in the web of metal separating chamber L from the upper portion of the main-passage, and its upper end engages the underside of valve D.

To understand and appreciate the operation of this improved valve, it must be borne in mind that the pressure of the water throughout the system in which said valve is installed, is, under normal conditions, constant, and that the flow through it is slow and even. When the water under pressure is released from the cylinder of the press, back of the ram, the water will slowly flow through the passage, b, and out of the outlets F of the housing to the pull-back cylinders. At the same time the water will also flow through port or passage m into the chamber L under piston-head N, and as the pressure on the underside of said pistonhead (which is greater in area than valve D) is greater than the pressure opposing the opening of valve D, said piston 71, will hold valve D off its seat and keep it off its seat continually, and permit the free passage of water past the same no matter in which way it may be flowing. If, however, the ram and parts connected thereto were at the'limit of their upward movement, and a break in the pipe-line 6 should occur, thus releasing the pressure under valve D, the latter would immediately shut down upon its seat and close bore 6, by the pressure on its upper side caused by the ram and platen and other parts supported thereby, and the water thus confined, would supportthe pull-back pistons and the ram, platen, and dies and prevent them dropping or descending. ,VVhen the ram and its parts were thus locked, should some one, not knowing about the break, attempt to operate the press by admitting water to the cylinder of the ram, the pressure caused by the downward move ment of the pull-back cylinders would open valve G and the oflset passage h and the water would discharge with considerable force, and; if a hose were employed could be directed toward the position usually occupied by the operator, and thus warn him so that he could turn off the pressure back of rain and stop the operation of the press and avoid greater danger.

\Vhat I claim as new is 1. The combination with a hydraulic press water pressure entering said passage, and

adapted to open said valve.

In mechanism of the kind specified, an emergency valve for connecting the pullback cylinder and accumulator pipes comhaving a pull-back cylinder for the platen thereof, of an accumulator cylinder, pipe;

connecting the same to said pull-back cylinder, a floating valve that automatically closes said pipe when a break occurs therein prising a suitable housing having a stepped passage therethrough, one end of which is enlarged to form a valve-chamber having a lateral outlet and a safety vent leading therefrom, a regulated tension floating valve adapted to close said chamber, a graduated pressure valve controlling said vent, a cylinder, and a piston in the same, which latter moves in the direction of the length of said chamber, is actuated by the pressure of the water entering said passage and is adapted which is enlarged to form a valve chamber,

which latter has a lateral outlet, a valve controlled safety vent leading therefrom, a floating valve adapted to close said chamber, and means movable in the direction of the length of said chamber and actuated by the water pressure entering said passage and adapted to hold said valve open.

3. In mechanism of the kind specified, an emergency valve for connecting the pullback cylinder and accumulator pipes comprising a suitable housing having a stepped passage therethrough, one end of which is enlarged to form a valvechamber, having a lateral outlet, an automatically returnable valve adapted to close said chamber, a valvecontrolled safety vent leading from said chamber, a cylinder, and a piston in the same, which latter moves in the direction of the length of said chamber, is actuated by the pressure of the water entering said passage and is adapted to open said valve.

at. In mechanism of the kind specified, an emergency valve for connecting the pullback cylinder and accumulator pipes comprising a suitable housing having a stepped passage therethrough, the outlet end of which is enlarged to form a valve-chamber, which latter has a lateral outlet, a safety vent leading from said chamber, a gradu ated pressure valve controlling said vent, a floating valve adapted to close said chamber,

and means movable in the direction of the 1 length of said chamber, and actuated by the to open said valve.

(3. In mechanism of the kind specified, an emergency valve for connecting the pullback cylinder and accumulator pipes comprising a suitable housing having a stepped passage therethrough one end of which is enlarged to form a valve-chamber from which a lateral outlet leads, a floating valve closing said chamber, having an axial spindle, a head closing the opposite end of said chamber having a dash-pot engaged by said valve-spindle, a graduated resistance controlling valve closing said vent, a cylinder, a piston in the same movable in the direction of length of said chamber, which is actuated by the pressure of the water entering said passage, and is adapted to open said valve.

7. In mechanism of the kind specified, an emergency valve for connecting the pullback cylinder and accumulator pipes comprising a suitable housing having a stepped passage therethrough, the outlet end of which is enlarged to form a valve-chamber, which latter has a safety vent, leading therefrom, a spindle valve controlling said vent, a spring bearing against the outer end there of, a gage-screw for graduating the pressure thereof against said spindle valve,a floating valve adapted to close said chamber, and means movable in the direction of the length of said chamber and actuated by the Water pressure entering said passage and adapted 1 to open said valve.

l l t In Witness whereof I have hereunto set my hand this 10th day of January 1910.

VILLIAM I. BETTENDORF. Witnesses:

A. B. FhENIER, J. II. ANDRE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

